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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e6577f256ad43581a17211055ab7acf96c2d6bff578f2cae7546049e2b28885' 
  AND token = 'B9vn/1+pIbUdkY3611CaWhXVzVhpgal2M4f0k7KbYSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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