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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed131ae535af8338a6e9374d22bcddaa220ffa9a23d696e54ac1995ffca5ec1f' 
  AND token = 'dzHh/mznwIBxd5I8grPD4U2H6lv9OkgfKfOHp88AsK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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