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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1eac37a8f59bc5d95ac5332f1ef6b98508dd5398472710931347bbdc61522eb' 
  AND token = 'cNPPTdK8mjWfs+LzFp/YDWtDTWTPB9CBregbDt5tw/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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