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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f61471491c160d2e5fc2e1abc428dd10d06f4a0d1b7de934eb93fd0fae20b22' 
  AND token = '30jFvLfLejubODrlW3GoD9LGo2UDfRcdNPwPaXizn+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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