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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65dbee0c7ebc08e24bdecd9b522acb964b7afc26e4ce64462023443f85f92eb6' 
  AND token = 'vfr05AzhO41GvL8oRfA8OFeRnPomnfMAJ97SDfWTzog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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