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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8513428183e24ef52077bd6fad3449374faf9cea9d3ab5e07d9b7720f65f572c' 
  AND token = 'uXirqKoIicCB6bQn5BMb4MCdj7s3duOT9yZ4aw4qZLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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