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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07f07501083d525be2b1f380f1676ad563b949d0ac8a0ed0c198bfe36cea2931' 
  AND token = 'KkV8E5CV/cjGwZx/WBAZWiycQi0UnpH3FZ/99tuyKIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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