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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0bbe377667c93033e1a0d0a7b283da41d2e8dc7068483410edad0f59860c506' 
  AND token = 'hCXwOoxU6hBAjCvXoUr5lSSpfgTGD1gLGOpwoBc13Z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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