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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe0ee5d9503dc00b9e153d44719b66d13f8cc1cd41fbde7cd832d0f4f4e9f568' 
  AND token = 'os1+PPEya5R4x0IcgggFXZfvtjQ9b2XaKv4I8CM9F+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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