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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97fe73e4f38ba5a5cb270f6bd8f475dbd7067bb93bfca8c0b7d05f39c63c3984' 
  AND token = 'AF6/xN6QEqxgK9SLEsuQrC59yd5TZEjST8RZhJpTXjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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