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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2843f813b731c4c95069ce9750ee771f3ae89f95db8e2a43c3bbe299ffcb0264' 
  AND token = '8avKWoFzCiSLFvPE2nbNrLI+cBQ9PC13L1vrWhWp4wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}