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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64c7ad04d1f61c66e62c5f73bb4b9361f9960e8497565992f03a77a5f029708d' 
  AND token = '/TsChmgmOhG6NY6G6VHj9f1pC9oOaHfyg8fnMZFoWfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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