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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54954369ff695f1dae71855189592f1eb87cbed32d89fc286fe66b05ae1675f4' 
  AND token = 'QJE9J75JtfvOYVSo4p2mmjPoMCVZyxdw7D0nJai0jS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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