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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1b20cc1ddb2d638defff8c3a5e37de62941dc98426419feab0247e30942089' 
  AND token = 'yLgM36jRL6uzxA47gqXYOko4nLtkWgqGVQjDajDkuLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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