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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b6e451757c990e694b7a965df77474dbe4ec70fbbfddb9ac4e6dadfce70af4' 
  AND token = 'UkcDeaiEV/mBW+v1qyg42OH/Ctk7Z6blkAX6mVTOGTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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