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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f94da486083573fed18ffbab4a9a5a4dbd421db196ba9979117f70a03cb34d56' 
  AND token = 'onvEsa1YYjXgt69W8H6qh6uVNR1UPIkklB9Oz00fw9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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