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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a58bc13505687196c0cf2a81f0cba7ed850c0ca589562d2737df3832539c6f2' 
  AND token = '0TdNx3qDKuPK/mWuNKkSjM48ItMx+6lHjDNhgd5qgvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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