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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7725136a0a93722b4e6748b00278bf6cb7a3eec97261aebde7d4f482dfbef3fc' 
  AND token = 'EKCVyEv2wpH6pqukwF9UmTxn/n5KfTcwXBKPkdUHvR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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