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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f990986680d13fd0092b8d80a19ba788f7305995e7a09119f5b2847d8ff6159' 
  AND token = 'WYUGOf94e5X5pTkigdq4aKoobi4VYIp1/zotLvwhr3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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