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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb3429afdd5935a5c59b7aeb53b91e5d674bd22a59c7fd51c1d4a803d18c7f7' 
  AND token = 'FLZVRncvqI6qkE8VxC8Lf/elTZYMQU3dl21JxxosUeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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