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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd940127e77e2f7a2660abd09508b2f0673ca829b95bd8868498ef7a8d1c88f0f' 
  AND token = 'Rd9xoCtNccZgQEiIYkpJp9j97YoiSjIxJczTeXaaXII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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