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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b1eec61d638a227995a86e92c73de5f509d4ae20a23d681c538c10c87c7fe29' 
  AND token = 'P1kvzBLoiTyGG5AAAA6qOxEY62QZKMse9QB7uNJf/w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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