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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9cae6a6b3facd5eb4bf695671112bf72914fbdc2f0c20ac0d031106f1264e33' 
  AND token = 'naGT6ZcRSylC7hXDt/jnNQbOe7sOfQ6ZgaCtIpMT4rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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