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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23cab813416e0058bcabe92224a6074423463d15c3ef4b8b478c70cc7489c0ca' 
  AND token = 'w9ERdGvzJS/xHnYRsWKSfMDdrkvOk5DJhho924tq7MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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