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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e38d18bc1dd55d91ddb8af81bc66af893034d8cab73a104ba8a79310ee56ad0b' 
  AND token = 'Erm3sRZPsL+N78HA05ggGY0YcquZ355EJa03iTZ5nwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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