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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf7bff288fb16b24bec57c77427aaadc044311e7ed688dbecbdbc718b6f3783' 
  AND token = '1tl0bZnJTn/LiD8cwlzbeHvPaKCh9IZK2h+Hd66dY3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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