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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fa5ec609c866f9e51d10ffe68b072b9d111bf988d593f9ad4ba1504ec819323' 
  AND token = 'Ut43Hqckvi0CwROu1JFrQNjUojG4UJARMUg95T/QHN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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