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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7d1f9ee887abb5a895934c5d1c33eac2542867dbad0c0be7f077b525dbbfd6a' 
  AND token = '5qesoOs9FtOLD7EASNQdpf97l4kB8hoO5oehF3wfMlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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