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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4acaa7cd0463029f0ab85b3810a49ebb4602027a677ed50a6601087a3c3402c1' 
  AND token = 'shXNbOxdJ03Zoq23cqNuqe9riJJ7czrToXWbfau50p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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