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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd390c9f4ca19b95bfd222e8c7cd12e7fa17ef583cdea2489de50b9f455b79674' 
  AND token = '80xIJQ4KSWO4MzlvaeOYyri4cZjtLdE+/GeQErw5DLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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