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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39276ebe7b71cda87d93f5bb4843ad18c9c997f858e8aa46640c648395b4420c' 
  AND token = '38nbL8UE0+8la6rZDEl8/wK/aZ+AkqmHdKWLp1JZEJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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