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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb197ba0ae9f6e5e6d1a9d029303a056647959909c61b209d1a77f31496024d7' 
  AND token = 'kUlgc/h0wfkhBAGqTofeI1eeeVupKyVG5l71X/hLE4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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