Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1490b69c2a52e8b0be304337d8a456a5c3077f68db2ddcb19614e6770f9ddd04' 
  AND token = 'VVEuOZmcTc7omaMXtqBFQwgA8xobyjWdGSbSd9rkVWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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