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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0454602a4a512694b79e1bc2a42cc9f73fd835a7d43fb0629ccc39d96ab18407' 
  AND token = 'NovKqa4VJLOH/6bwckg4BZ6QtbohET6tf5cPD+LqQHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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