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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b688700c9da5d2d7ed96cd2b569edfa66684328e39a5e3f290eef692dcd85fb' 
  AND token = 'xHqhmPvKOBy8aPmOau6dx/kVHOLaAloln2jSS6DZA/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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