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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18ed0ce678a96c3f0ab9ceb232fdb46d156a873d2659567cd978c45871e509ea' 
  AND token = 'g9O6yA+bE4BE+KoUuSLn7Qucgct83KbwISMJEC9OHXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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