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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '555a228ef09e4c588b7fb92a6fb022b7e4c3ff76d79a76584140685667d6baac' 
  AND token = 'La1EKuWgrMiy6kjosPMAwZNrtEHgQVgu2o04IxLXrBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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