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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdcb9e74dc640dee5187175338837670f26c59f0b0a611603cf952011249bc81' 
  AND token = 'xEHOUhji09mq9buZG0KsQ+kJBMBWonDBMht9U8HXX9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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