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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a882b5b44cb1a2dd518edc6eaee15a6d5ac598e0746fcf164c6163c53d4fca' 
  AND token = 'sscQUP/Ns8akFPFNc+gZlX1PRG7CqmPfHX8bfDEvmpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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