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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f61697ed6f55860b216133bf2137350427078b58fbdfb7867459f5094dbca0c' 
  AND token = 'Y22ACTX0NhbRZ7bMhSILjx77N6ymq/8h3YobrXgus2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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