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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4b25765715732adb34b48a5453812ae9c65d9aa6cb1b182c1c1194bcdeca746' 
  AND token = 'WX67TksVJiCtT/cq8g9j7tdtSV+hjdndKS9kD+fi+yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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