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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61ce537f46a51b662df02ff6cdc5f9898081e9fac3def348347a871f0b1bff5b' 
  AND token = 'dcSB8ZlOpoEIh5Q/si6z5ohCoJ4Jwfp/xDlYtAJtQJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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