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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcfd45ab9f403acb0a2a7cbc08f6b5c5be4133ed38486dae7f7a7413adb3e578' 
  AND token = 'dbxQ1tPnVXB3/WyIBjtMmuClBRs8oFiafoNlS0hAjfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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