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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ce962405e332a36f9806157312f5ac6ec730b36d1a9d5436606dd8b3b6d203' 
  AND token = 'bwJlyjXOJ+VMaYBbXgR0W5EmcvFVyMT0tMZNOv3ekfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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