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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef6b3ad0d2d8157cb75150e28b2758ffd975e8a446c21714eef2fed7d7114d16' 
  AND token = 'RpjP51krpTqQg65gfhD5xp9Mkh/iGojjcIdgDyC/EOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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