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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ede039681074b04b03bd1d605969cbb54c7f8136b7f3c2131d3273976b35b8d0' 
  AND token = '3Iwb7CStH5hSKR4cmqLoUS9t8ZI2iFW6tAZcbAcMIpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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