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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '930ddfb197c58fe42fcdac8d76ce6b9374291ab0af851f39db7c1fc2cbd66adb' 
  AND token = '/8u0KBbj3KoAVFQXGK6m2Bkf5skvD1di/9Ec6H7ulgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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