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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd28bad9d6acd3bea2fb790515220bf2aef8875cd483cfbfaf505c2d8443f9455' 
  AND token = 'Um8+JlLkiSLIqRB2rj6ZdSWuMA6C6YLXxZyEVWupnic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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