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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ce86991d2ce542a71ac24b8476961f6cbc7419740c574fc1ebf289eae97e400' 
  AND token = 'XtZ/N9P7oGJSFx8A3LgLQ58chSGQR6zlPYdPqCHAwv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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