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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8ba578c955760cc0768e38494164dbf3de1f666ec5734a5b67657ab181d6563' 
  AND token = '5m9u6TxJO0oyM46xT5allblzwW0lqwMbB+I/3jbKLTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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