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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '970af6310c98103a43ac1bb07b4e63466a6bf900fb503bbf34489d6235a9f8b8' 
  AND token = 'i1WYke8dOYsne1sqHZn3V2CVvdNBI1jBUPtMTYlL1AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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