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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2cde11271ef8978aecc88f68d8b159b75087ce1dee88f994fdaa4fc7a9b7ec3' 
  AND token = 'fCbASaqd5wSvCryGoISoz8QRw5sYPMgk1amOWsHhJ5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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