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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd19c50bfedbfad5df5b7e41c796c77c8b5637ca9a9bd5819a2ba1dedd721de1' 
  AND token = 'YXAT0XpCteAymx1fVZx44KHOFIeuYeN4MGh9N6WV1mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00127

JSON explain

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