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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d86154eb2d2eafe5bf9d4babbb7d6ae1b623f4011a818191e766bb04bcffb8c' 
  AND token = 'ykG/QvdHOHpy9Q7uBaT8+MFIbPS7HbYK/hFg4SZl96E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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