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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb8a0967a91569a9d2bde5fc330d2f23e947fec081d40e140429401d82db3735' 
  AND token = 'LpxHuApPe2NwT6AS/ytruqJEMAzj6LUF7qonH+vqupU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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