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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e02af0ba0941d6433fab1078bb35cdafebb6048ddb6dcc25d736b94e83b972dc' 
  AND token = '7MY5OzG0Pv3tvakwacGypd1vVzxvkNHSr8PttGD4Xf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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