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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7f23f8f02e08e6286796b88688ba0c0730bad47cec277ec8d3cb040f3fc5046' 
  AND token = '6JmgdD6ntUOM3qp0aawnMhZ1/LQ9ZGVDgUVhvqB5ngA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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