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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a167eb3e1a21fd372a9226194f7cf6c7f3a5eed98471f649a8d29a4f29dbc83b' 
  AND token = 'i5rhfh2l11OS1CmBfQcC95UzdA62HR+/CZ+75YRqZ+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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